Bell & Gossett MM 217L Series 150S and 157S Low Water Cut-Offs/Pump Controllers - Manual (Page 6)

b. Install a water gauge glass (J).
Note: Gauge glass and tri-cocks
not included with product.
J
J
H
a. Install a water column (H) (not
included with product) for all models
except Series 157S (with integral
water column).
Series 157S All Other Models
6
C
A
A
C
F
G
E
D
c. Mount and pipe the low water cut-off (D) on
a vertical equalizing pipe (E) at the required
elevation level, as determined in Step 1.
Install a full ported blow down valve (G)
directly below the lower cross of the water
equalizing pipe (F).
Note: 1” NPT tappings are provided, with
the exception of some 157 and 157S models
which are 14” NPT.
b. For Model 150S-B and Series 157S
(For all other models, proceed to Step 3).
Screw the w” NPT steel plug (C) (provided)
in tapping (A).
Series 157S Models 150S-B
STEP 3 - Installing a Water Gauge Glass (Required on all steam boilers)
The plug must be reinstalled before control is
shipped installed on the boiler, and removed
when boiler is installed after shipment.
Failure to follow this caution may damage float
and operating mechanism.
! CAUTION